[Mono-list] multi-threading operation on Oracle database led to program crash !!!

ibrahim steed ibrahim.steed at gmail.com
Wed Oct 28 21:21:06 EDT 2009


I run another time and show following crash message:


*** glibc detected *** mono: malloc(): memory corruption: 0x00002aaaabdbb110
***
======= Backtrace: =========
/lib64/libc.so.6[0x2b8d8e25034e]
/lib64/libc.so.6[0x2b8d8e2522d4]
/lib64/libc.so.6(calloc+0x9f)[0x2b8d8e2537bf]
[0x40ada83c]
======= Memory map: ========
00400000-0066e000 r-xp 00000000 68:06 69560                             
/usr/bi n/mono
0076d000-00770000 rw-p 0026d000 68:06 69560                             
/usr/bi n/mono
00770000-00ae1000 rw-p 00770000 00:00 0                                 
[heap]
40000000-40020000 rwxp 40000000 00:00 0
40020000-40021000 ---p 40020000 00:00 0
40021000-40024000 rwxp 40021000 00:00 0
40024000-40025000 ---p 40024000 00:00 0
40025000-40285000 rwxp 40025000 00:00 0
40285000-40286000 ---p 40285000 00:00 0
40286000-40486000 rwxp 40286000 00:00 0
40486000-40487000 ---p 40486000 00:00 0
40487000-40697000 rwxp 40487000 00:00 0
40697000-40698000 ---p 40697000 00:00 0
40698000-40898000 rwxp 40698000 00:00 0
40898000-40899000 ---p 40898000 00:00 0
40899000-40ae9000 rwxp 40899000 00:00 0
2aaaaaaac000-2aaaaaae0000 rw-p 2aaaaaaac000 00:00 0
2aaaaaae0000-2aaaaaae1000 rw-s 00000000 00:0e 41233776                  
/dev/sh m/mono.7225
2aaaaaae1000-2aaaaaaf1000 rw-p 2aaaaaae1000 00:00 0
2aaaaaaf1000-2aaaaaaf5000 r--p 00000000 68:02 82246                     
/home/m azhi/wpm/command/wpmcmd/CommandAgent/bin/Release/CommandAgent.exe
2aaaaaaf5000-2aaaaad68000 r--p 00000000 68:06 69622                     
/usr/li b/mono/2.0/mscorlib.dll
2aaaaad68000-2aaaaad9d000 r--s 00000000 68:04 8612                      
/var/ru n/nscd/passwd
2aaaaad9d000-2aaaaadb2000 rw-s 00000000 68:04 9002                      
/root/. wapi/shared_data-paramsys-Linux-x86_64-328-12-0
2aaaaadb2000-2aaaab19b000 rw-s 00000000 68:04 9062                      
/root/. wapi/shared_fileshare-paramsys-Linux-x86_64-40-12-0
2aaaab19b000-2aaaab19c000 rw-p 2aaaab19b000 00:00 0
2aaaab19c000-2aaaab1db000 ---p 2aaaab19c000 00:00 0
2aaaab1db000-2aaaab1ff000 rw-p 2aaaab1db000 00:00 0
2aaaab1ff000-2aaaab201000 r--p 00000000 68:02 82227                     
/home/m azhi/wpm/command/wpmcmd/CommandAgent/bin/Release/Log.dll
2aaaab201000-2aaaab205000 r--p 00000000 68:02 82216                     
/home/m
azhi/wpm/command/wpmcmd/CommandAgent/bin/Release/ConfigurationHandler.dll
2aaaab205000-2aaaab223000 r--p 00000000 68:06 69722                     
/usr/li
b/mono/gac/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.d
ll
2aaaab223000-2aaaab3b2000 r--p 00000000 68:06 69756                     
/usr/li b/mono/gac/System/2.0.0.0__b77a5c561934e089/System.dll
2aaaab3b2000-2aaaab3b4000 r--p 00000000 68:02 82237                     
/home/m azhi/wpm/command/wpmcmd/CommandAgent/bin/Release/InterProcess.dll
2aaaab3b4000-2aaaab3ec000 r--p 00000000 68:02 82215                     
/home/m azhi/wpm/command/wpmcmd/CommandAgent/bin/Release/log4net.dll
2aaaab3ec000-2aaaab40d000 rw-p 2aaaab3ec000 00:00 0
2aaaab40d000-2aaaab542000 r--p 00000000 68:06 69750                     
/usr/li b/mono/gac/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
2aaaab542000-2aaaab64a000 rw-p 2aaaab542000 00:00 0
2aaaab64a000-2aaaab656000 r--p 00000000 68:06 71944                     
/usr/li
b/mono/gac/System.EnterpriseServices/2.0.0.0__b03f5f7f11d50a3a/System.Enterprise
Services.dll
2aaaab656000-2aaaab659000 r--p 00000000 68:02 82233                     
/home/m azhi/wpm/command/wpmcmd/CommandAgent/bin/Release/OraAccess.dll
2aaaab659000-2aaaab67e000 r--p 00000000 68:06 72237                     
/usr/li
b/mono/gac/System.Data.OracleClient/2.0.0.0__b77a5c561934e089/System.Data.Oracle
Client.dll
2aaaab67e000-2aaaab685000 r--p 00000000 68:06 71947                     
/usr/li
b/mono/gac/System.Transactions/2.0.0.0__b77a5c561934e089/System.Transactions.dll
2aaaab700000-2aaaab75b000 rw-p 2aaaab700000 00:00 0
2aaaab75b000-2aaaab800000 ---p 2aaaab75b000 00:00 0
2aaaab800000-2aaaab8ff000 rw-p 2aaaab800000 00:00 0
2aaaab8ff000-2aaaab900000 ---p 2aaaab8ff000 00:00 0
2aaaab900000-2aaaab902000 r--p 00000000 68:02 8Stacktrace:

  at (wrapper managed-to-native)
System.Data.OracleClient.Oci.OciCalls.calloc (i nt,int) <0x0005c>
  at (wrapper managed-to-native)
System.Data.OracleClient.Oci.OciCalls.calloc (i nt,int) <0xffffffff>
  at System.Data.OracleClient.Oci.OciCalls.AllocateClear (int) <0x0002b>
  at System.Data.OracleClient.Oci.OciDefineHandle.DefineChar
(int,System.Data.Or acleClient.OracleConnection) <0x0003f>
  at System.Data.OracleClient.Oci.OciDefineHandle.Define
(int,System.Data.Oracle Client.OracleConnection) <0x00173>
  at System.Data.OracleClient.Oci.OciDefineHandle.DefineByPosition
(int,System.D ata.OracleClient.OracleConnection) <0x000a3>
  at System.Data.OracleClient.Oci.OciStatementHandle.GetDefineHandle
(int,System .Data.OracleClient.OracleConnection) <0x00073>
  at System.Data.OracleClient.Oci.OciStatementHandle.Define
(System.Data.OracleC lient.OracleConnection) <0x00057>
  at System.Data.OracleClient.Oci.OciStatementHandle.Define () <0x00027>
  at System.Data.OracleClient.Oci.OciStatementHandle.Execute
(bool,bool,bool) <0 x000ef>
  at System.Data.OracleClient.Oci.OciStatementHandle.ExecuteQuery (bool)
<0x0001 b>
  at System.Data.OracleClient.OracleCommand.ExecuteReader
(System.Data.CommandBe havior) <0x00123>
  at (wrapper remoting-invoke-with-check)
System.Data.OracleClient.OracleCommand .ExecuteReader
(System.Data.CommandBehavior) <0xffffffff>
  at DataAccess.OraAccess.ReaderQuery (string) <0x000b7>
  at Persistence.DatabasePersistence.GetSchemaListByStatus
(Common.ScheduleType)  <0x000f9>
  at CommandAgent.CommandInvoker.Invoke () <0x0006b>
  at CommandAgent.SchemaPoll.Procedure () <0x00027>
  at (wrapper runtime-invoke) object.runtime_invoke_void__this__
(object,intptr, intptr,intptr) <0xffffffff>

Native stacktrace:

        mono(mono_handle_native_sigsegv+0xb0) [0x48c230]
        /lib64/libpthread.so.0 [0x2b8d8df85c10]
        /lib64/libc.so.6(gsignal+0x35) [0x2b8d8e214b95]
        /lib64/libc.so.6(abort+0x110) [0x2b8d8e215f90]
        /lib64/libc.so.6 [0x2b8d8e24b35b]
        /lib64/libc.so.6 [0x2b8d8e25034e]
        /lib64/libc.so.6 [0x2b8d8e2522d4]
        /lib64/libc.so.6(calloc+0x9f) [0x2b8d8e2537bf]
        [0x40ada83c]

Debug info from gdb:

Using host libthread_db library "/lib64/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 47886977035072 (LWP 7225)]
[New Thread 1084852544 (LWP 7282)]
[New Thread 1082751296 (LWP 7281)]
[New Thread 1080584512 (LWP 7272)]
[New Thread 1078483264 (LWP 7270)]
[New Thread 1075988800 (LWP 7229)]
[New Thread 1073887552 (LWP 7226)]
0x00002b8d8df821c6 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
  7 Thread 1073887552 (LWP 7226)  0x00002b8d8df85231 in fmod ()
   from /lib64/libpthread.so.0
  6 Thread 1075988800 (LWP 7229)  0x00002b8d8e2af478 in
__lll_mutex_lock_wait
    () from /lib64/libc.so.6
  5 Thread 1078483264 (LWP 7270)  0x00002b8d8e296fcb in fmod ()
   from /lib64/libc.so.6
  4 Thread 1080584512 (LWP 7272)  0x00002b8d8df821c6 in
pthread_cond_wait@@GLIBC _2.3.2 () from /lib64/libpthread.so.0
  3 Thread 1082751296 (LWP 7281)  0x00002b8d8df84b8b in fmod ()
   from /lib64/libpthread.so.0
  2 Thread 1084852544 (LWP 7282)  0x00002b8d8df8494b in fmod ()
   from /lib64/libpthread.so.0
  1 Thread 47886977035072 (LWP 7225)  0x00002b8d8df821c6 in
pthread_cond_wait@@G LIBC_2.3.2 () from /lib64/libpthread.so.0

Thread 7 (Thread 1073887552 (LWP 7226)):
#0  0x00002b8d8df85231 in fmod () from /lib64/libpthread.so.0
#1  0x000000000055dcaf in collection_thread (unused=<value optimized out>)
    at collection.c:34
#2  0x00002b8d8df7e143 in start_thread () from /lib64/libpthread.so.0
#3  0x00002b8d8e2a474d in clone () from /lib64/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 6 (Thread 1075988800 (LWP 7229)):
#0  0x00002b8d8e2af478 in __lll_mutex_lock_wait () from /lib64/libc.so.6
#1  0x00002aaaabd85840 in ?? ()
#2  0x0000000000000008 in ?? ()
#3  0x00002b8d8e2549df in fmod () from /lib64/libc.so.6
#4  0xff1868b806eba217 in ?? ()
#5  0xff184212eae2021b in ?? ()
#6  0x00002aaa00000000 in ?? ()
#7  0x0000000000000035 in ?? ()
#8  0x0000000000000000 in ?? ()

Thread 5 (Thread 1078483264 (LWP 7270)):
#0  0x00002b8d8e296fcb in fmod () from /lib64/libc.so.6
#1  0x000000004027edf5 in ?? ()
#2  0x0000000000a00aa0 in ?? ()
#3  0x00002aaaaaadb4c8 in ?? ()
#4  0x00002aaaab5f9000 in ?? ()
#5  0x0000000000000000 in ?? ()

Thread 4 (Thread 1080584512 (LWP 7272)):
#0  0x00002b8d8df821c6 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
(handle=0x40c,
    timeout=0x0, alertable=1, poll=0) at handles.c:1605
#2  0x0000000000579fc0 in WaitForSingleObjectEx (handle=0x40c,
    timeout=4294967295, alertable=1) at wait.c:205
#3  0x000000000050c6b3 in
ves_icall_System_Threading_WaitHandle_WaitOne_internal  (this=<value
optimized out>, handle=0x40c, ms=-1,
    exitContext=<value optimized out>) at threads.c:1446
#4  0x0000000040282b0e in ?? ()
#5  0x0000000000874e90 in ?? ()
#6  0x0000195907230892 in ?? ()
#7  0x0000000000000000 in ?? ()

Thread 3 (Thread 1082751296 (LWP 7281)):
#0  0x00002b8d8df84b8b in fmod () from /lib64/libpthread.so.0
#1  0x0000000000574034 in _wapi_accept (fd=6, addr=0x0, addrlen=0x0)
    at sockets.c:209
#2  0x0000000000516b33 in
ves_icall_System_Net_Sockets_Socket_Accept_internal (
    sock=6, error=0x40896e7c, blocking=<value optimized out>)
    at socket-io.c:892
#3  0x000000004069340e in ?? ()
#4  0x00000000009f77d0 in ?? ()
#5  0x00002aaaaaadb990 in ?? ()
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 1084852544 (LWP 7282)):
#0  0x00002b8d8df8494b in fmod () from /lib64/libpthread.so.0
#1  0x000000000048c3a3 in mono_handle_native_sigsegv (
    signal=<value optimized out>, ctx=<value optimized out>)
    at /usr/include/bits/unistd.h:35
#2  <signal handler called>
#3  0x00002b8d8e214b95 in raise () from /lib64/libc.so.6
#4  0x00002b8d8e215f90 in abort () from /lib64/libc.so.6
#5  0x00002b8d8e24b35b in __libc_message () from /lib64/libc.so.6
#6  0x00002b8d8e25034e in malloc_printerr () from /lib64/libc.so.6
#7  0x00002b8d8e2522d4 in _int_malloc () from /lib64/libc.so.6
#8  0x00002b8d8e2537bf in calloc () from /lib64/libc.so.6
#9  0x0000000040ada83c in ?? ()
#10 0x000000000087ec90 in ?? ()
#11 0x00000000004d6628 in mono_object_new_specific (vtable=0x1)
    at object.c:3603
#12 0x0000000000000001 in ?? ()
#13 0x00002aaaab400c00 in ?? ()
#14 0x00002aaaab400c00 in ?? ()
#15 0x0000000000002ee0 in ?? ()
#16 0x0000000040ada79c in ?? ()
#17 0x00002aaaaeb4a7e8 in ?? ()
#18 0x0000000040ada6d0 in ?? ()
#19 0x0000000000000006 in ?? ()
#20 0x0000000000002ee0 in ?? ()
#21 0x00002aaaab5a3310 in ?? ()
#22 0x0000000040ada22c in ?? ()
#23 0x0000000000000000 in ?? ()

Thread 1 (Thread 47886977035072 (LWP 7225)):
#0  0x00002b8d8df821c6 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
(handle=0x400,
    timeout=0x0, alertable=1, poll=0) at handles.c:1605
#2  0x000000000057aa1d in WaitForMultipleObjectsEx (numobjects=3,
    handles=0x2aaaab8008d0, waitall=0, timeout=4294967295, alertable=0)
    at wait.c:723
#3  0x000000000050ff01 in mono_thread_manage () at threads.c:2497
#4  0x0000000000473153 in mono_main (argc=2, argv=<value optimized out>)
    at driver.c:1648
#5  0x00002b8d8e202154 in __libc_start_main () from /lib64/libc.so.6
#6  0x0000000000422139 in _start ()
#0  0x00002b8d8df821c6 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0

=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

Aborted



ibrahim steed wrote:
> 
> I used Mono+System.Data.OracleClient+instantclient to access Oracle
> database in multi-threading way on x64bit SUSE Linux. 
> 
> Your reply will be highly appreciated!
> 
> My program run several minutes and crashed and exited with following
> message:
> 
> Stacktrace:
> 
> 
> Native stacktrace:
> 
>         mono(mono_handle_native_sigsegv+0xb0) [0x48c230]
>         mono(mono_arch_handle_altstack_exception+0xf5) [0x4bbf55]
>         /lib64/libpthread.so.0 [0x2aed9a374c10]
>         /opt/oracle/oradb/home/lib/libclntsh.so(kpcsncharset2ucs2+0x2b)
> [0x2aaaac9788e3]
>         /opt/oracle/oradb/home/lib/libclntsh.so(OCICharSetToUnicode+0x9)
> [0x2aaaac8a6a93]
>         [0x40adf508]
> 
> Debug info from gdb:
> 
> Using host libthread_db library "/lib64/libthread_db.so.1".
> [Thread debugging using libthread_db enabled]
> [New Thread 47199987718976 (LWP 18957)]
> [New Thread 1102186816 (LWP 18971)]
> [New Thread 1100085568 (LWP 18970)]
> [New Thread 1097984320 (LWP 18969)]
> [New Thread 1091615040 (LWP 18966)]
> [New Thread 1089448256 (LWP 18965)]
> [New Thread 1084852544 (LWP 18963)]
> [New Thread 1082751296 (LWP 18962)]
> [New Thread 1080584512 (LWP 18961)]
> [New Thread 1078483264 (LWP 18960)]
> [New Thread 1075988800 (LWP 18959)]
> [New Thread 1073887552 (LWP 18958)]
> 0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
>   12 Thread 1073887552 (LWP 18958)  0x00002aed9a374231 in fmod () from
> /lib64/libpthread.so.0
>   11 Thread 1075988800 (LWP 18959)  0x00002aed9a372dfd in sem_wait () from
> /lib64/libpthread.so.0
>   10 Thread 1078483264 (LWP 18960)  0x00002aed9a685fcb in fmod () from
> /lib64/libc.so.6
>   9 Thread 1080584512 (LWP 18961)  0x00002aed9a3711c6 in
> pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
>   8 Thread 1082751296 (LWP 18962)  0x00002aed9a373b8b in fmod () from
> /lib64/libpthread.so.0
>   7 Thread 1084852544 (LWP 18963)  0x00002aed9a37394b in fmod () from
> /lib64/libpthread.so.0
>   6 Thread 1089448256 (LWP 18965)  0x00002aed9a3711c6 in
> pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
>   5 Thread 1091615040 (LWP 18966)  0x00002aed9a693b68 in fmod () from
> /lib64/libc.so.6
>   4 Thread 1097984320 (LWP 18969)  0x00002aed9a3711c6 in
> pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
>   3 Thread 1100085568 (LWP 18970)  0x00002aed9a3711c6 in
> pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
>   2 Thread 1102186816 (LWP 18971)  0x00002aed9a3711c6 in
> pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
>   1 Thread 47199987718976 (LWP 18957)  0x00002aed9a3711c6 in
> pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
> 
> Thread 12 (Thread 1073887552 (LWP 18958)):
> #0  0x00002aed9a374231 in fmod () from /lib64/libpthread.so.0
> #1  0x000000000055dcaf in collection_thread (unused=<value optimized out>)
> at collection.c:34
> #2  0x00002aed9a36d143 in start_thread () from /lib64/libpthread.so.0
> #3  0x00002aed9a69374d in clone () from /lib64/libc.so.6
> #4  0x0000000000000000 in ?? ()
> 
> Thread 11 (Thread 1075988800 (LWP 18959)):
> #0  0x00002aed9a372dfd in sem_wait () from /lib64/libpthread.so.0
> #1  0x00000000004ef998 in finalizer_thread (unused=<value optimized out>)
> at gc.c:1058
> #2  0x000000000050ec6c in start_wrapper (data=<value optimized out>) at
> threads.c:623
> #3  0x00000000005773b3 in thread_start_routine (args=0x7dc560) at
> threads.c:286
> #4  0x0000000000593192 in GC_start_routine (arg=<value optimized out>) at
> pthread_support.c:1382
> #5  0x00002aed9a36d143 in start_thread () from /lib64/libpthread.so.0
> #6  0x00002aed9a69374d in clone () from /lib64/libc.so.6
> #7  0x0000000000000000 in ?? ()
> 
> Thread 10 (Thread 1078483264 (LWP 18960)):
> #0  0x00002aed9a685fcb in fmod () from /lib64/libc.so.6
> #1  0x000000004027f625 in ?? ()
> #2  0x00000000009820d0 in ?? ()
> #3  0x00002aaaaaadb4c8 in ?? ()
> #4  0x00002aaaab5f9000 in ?? ()
> #5  0x0000000000000020 in ?? ()
> #6  0x0000000040485068 in ?? ()
> #7  0x0000000040484fc0 in ?? ()
> #8  0x0000000040484f00 in ?? ()
> #9  0x00002aaaaaadb4c8 in ?? ()
> #10 0x00002aaaab5f9000 in ?? ()
> #11 0x0000000000000020 in ?? ()
> #12 0x00002aaaab1e8ca0 in ?? ()
> #13 0x000000004027f4d0 in ?? ()
> #14 0x0000000000000004 in ?? ()
> #15 0x00002aaaab1e8ca0 in ?? ()
> #16 0x0000000000000000 in ?? ()
> 
> Thread 9 (Thread 1080584512 (LWP 18961)):
> #0  0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
> (handle=0x40d, timeout=0x0, alertable=1, poll=0)
>     at handles.c:1605
> #2  0x0000000000579fc0 in WaitForSingleObjectEx (handle=0x40d,
> timeout=4294967295, alertable=1) at wait.c:205
> #3  0x000000000050c6b3 in
> ves_icall_System_Threading_WaitHandle_WaitOne_internal (this=<value
> optimized out>, handle=0x40d,
>     ms=-1, exitContext=<value optimized out>) at threads.c:1446
> #4  0x000000004028353e in ?? ()
> #5  0x0000000000a1ccc0 in ?? ()
> #6  0x000018aeea14452c in ?? ()
> #7  0x0000000000000000 in ?? ()
> 
> Thread 8 (Thread 1082751296 (LWP 18962)):
> #0  0x00002aed9a373b8b in fmod () from /lib64/libpthread.so.0
> #1  0x0000000000574034 in _wapi_accept (fd=6, addr=0x0, addrlen=0x0) at
> sockets.c:209
> #2  0x0000000000516b33 in
> ves_icall_System_Net_Sockets_Socket_Accept_internal (sock=6,
> error=0x40896e7c,
>     blocking=<value optimized out>) at socket-io.c:892
> #3  0x0000000040a9904e in ?? ()
> #4  0x000000000087ec90 in ?? ()
> #5  0x00002aaaaaadb198 in ?? ()
> #6  0x0000000000000000 in ?? ()
> 
> Thread 7 (Thread 1084852544 (LWP 18963)):
> #0  0x00002aed9a37394b in fmod () from /lib64/libpthread.so.0
> #1  0x000000000048c3a3 in mono_handle_native_sigsegv (signal=<value
> optimized out>, ctx=<value optimized out>)
>     at /usr/include/bits/unistd.h:35
> #2  0x00000000004bbf55 in mono_arch_handle_altstack_exception
> (sigctx=0x2aaaab649c40, fault_addr=<value optimized out>,
>     stack_ovf=0) at exceptions-amd64.c:910
> #3  <signal handler called>
> #4  0x00002aaaac9788e3 in kpcsncharset2ucs2 () from
> /opt/oracle/oradb/home/lib/libclntsh.so
> #5  0x00002aaaac8a6a93 in OCICharSetToUnicode () from
> /opt/oracle/oradb/home/lib/libclntsh.so
> #6  0x0000000040adf508 in ?? ()
> #7  0x0000000000874de0 in ?? ()
> #8  0x00002aaaae9969f0 in ?? ()
> #9  0x0000000040a97bfc in ?? ()
> #10 0x00002aaaaed27000 in ?? ()
> #11 0x00002aaaabcc4260 in ?? ()
> #12 0x0000000000000000 in ?? ()
> 
> Thread 6 (Thread 1089448256 (LWP 18965)):
> #0  0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
> (handle=0x401, timeout=0x0, alertable=1, poll=0)
>     at handles.c:1605
> #2  0x0000000000579fc0 in WaitForSingleObjectEx (handle=0x401,
> timeout=4294967295, alertable=1) at wait.c:205
> #3  0x0000000000513121 in async_invoke_thread (data=0x0) at
> threadpool.c:1424
> #4  0x000000000050ec6c in start_wrapper (data=<value optimized out>) at
> threads.c:623
> #5  0x00000000005773b3 in thread_start_routine (args=0x7dcf88) at
> threads.c:286
> #6  0x0000000000593192 in GC_start_routine (arg=<value optimized out>) at
> pthread_support.c:1382
> #7  0x00002aed9a36d143 in start_thread () from /lib64/libpthread.so.0
> #8  0x00002aed9a69374d in clone () from /lib64/libc.so.6
> #9  0x0000000000000000 in ?? ()
> 
> Thread 5 (Thread 1091615040 (LWP 18966)):
> #0  0x00002aed9a693b68 in fmod () from /lib64/libc.so.6
> #1  0x0000000000511d34 in socket_io_epoll_main (p=<value optimized out>)
> at threadpool.c:600
> #2  0x000000000050ec6c in start_wrapper (data=<value optimized out>) at
> threads.c:623
> #3  0x00000000005773b3 in thread_start_routine (args=0x7dd1e0) at
> threads.c:286
> #4  0x0000000000593192 in GC_start_routine (arg=<value optimized out>) at
> pthread_support.c:1382
> #5  0x00002aed9a36d143 in start_thread () from /lib64/libpthread.so.0
> #6  0x00002aed9a69374d in clone () from /lib64/libc.so.6
> #7  0x0000000000000000 in ?? ()
> 
> Thread 4 (Thread 1097984320 (LWP 18969)):
> #0  0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
> (handle=0x401, timeout=0x0, alertable=1, poll=0)
>     at handles.c:1605
> #2  0x0000000000579fc0 in WaitForSingleObjectEx (handle=0x401,
> timeout=4294967295, alertable=1) at wait.c:205
> #3  0x0000000000513121 in async_invoke_thread (data=0x0) at
> threadpool.c:1424
> #4  0x000000000050ec6c in start_wrapper (data=<value optimized out>) at
> threads.c:623
> #5  0x00000000005773b3 in thread_start_routine (args=0x7dd5c8) at
> threads.c:286
> #6  0x0000000000593192 in GC_start_routine (arg=<value optimized out>) at
> pthread_support.c:1382
> #7  0x00002aed9a36d143 in start_thread () from /lib64/libpthread.so.0
> #8  0x00002aed9a69374d in clone () from /lib64/libc.so.6
> #9  0x0000000000000000 in ?? ()
> 
> Thread 3 (Thread 1100085568 (LWP 18970)):
> #0  0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
> (handle=0x401, timeout=0x0, alertable=1, poll=0)
>     at handles.c:1605
> #2  0x0000000000579fc0 in WaitForSingleObjectEx (handle=0x401,
> timeout=4294967295, alertable=1) at wait.c:205
> #3  0x0000000000513121 in async_invoke_thread (data=0x0) at
> threadpool.c:1424
> #4  0x000000000050ec6c in start_wrapper (data=<value optimized out>) at
> threads.c:623
> #5  0x00000000005773b3 in thread_start_routine (args=0x7dd8e8) at
> threads.c:286
> #6  0x0000000000593192 in GC_start_routine (arg=<value optimized out>) at
> pthread_support.c:1382
> #7  0x00002aed9a36d143 in start_thread () from /lib64/libpthread.so.0
> #8  0x00002aed9a69374d in clone () from /lib64/libc.so.6
> #9  0x0000000000000000 in ?? ()
> 
> Thread 2 (Thread 1102186816 (LWP 18971)):
> #0  0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
> (handle=0x401, timeout=0x0, alertable=1, poll=0)
>     at handles.c:1605
> #2  0x0000000000579fc0 in WaitForSingleObjectEx (handle=0x401,
> timeout=4294967295, alertable=1) at wait.c:205
> #3  0x0000000000513121 in async_invoke_thread (data=0x0) at
> threadpool.c:1424
> #4  0x000000000050ec6c in start_wrapper (data=<value optimized out>) at
> threads.c:623
> #5  0x00000000005773b3 in thread_start_routine (args=0x7dd9b0) at
> threads.c:286
> #6  0x0000000000593192 in GC_start_routine (arg=<value optimized out>) at
> pthread_support.c:1382
> #7  0x00002aed9a36d143 in start_thread () from /lib64/libpthread.so.0
> #8  0x00002aed9a69374d in clone () from /lib64/libc.so.6
> #9  0x0000000000000000 in ?? ()
> 
> Thread 1 (Thread 47199987718976 (LWP 18957)):
> #0  0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x0000000000562b0a in _wapi_handle_timedwait_signal_handle
> (handle=0x400, timeout=0x0, alertable=1, poll=0)
>     at handles.c:1605
> #2  0x000000000057aa1d in WaitForMultipleObjectsEx (numobjects=3,
> handles=0x2aaaab710ed0, waitall=0, timeout=4294967295,
>     alertable=0) at wait.c:723
> #3  0x000000000050ff01 in mono_thread_manage () at threads.c:2497
> #4  0x0000000000473153 in mono_main (argc=2, argv=<value optimized out>)
> at driver.c:1648
> #5  0x00002aed9a5f1154 in __libc_start_main () from /lib64/libc.so.6
> #6  0x0000000000422139 in _start ()
> #0  0x00002aed9a3711c6 in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> 
> =================================================================
> Got a SIGSEGV while executing native code. This usually indicates
> a fatal error in the mono runtime or one of the native libraries
> used by your application.
> =================================================================
> 
> Aborted
> 
> 
> 
> 
> 
> I wrote following code:
> 
> using System;
> using System.Net.Sockets;
> using System.Threading;
> 
> //using some my namespace
> 
> namespace CommandAgent
> {
> 	class MainClass
> 	{
> 		public static void Main(string[] args)
> 		{
> 		
> 			SchemaServer schemaServer=new SchemaServer();
> 			Thread threadServer=new Thread(new
> ThreadStart(schemaServer.Procedure));
> 			threadServer.Start();	
> 					
> 			Thread threadPoll=new Thread(new ThreadStart(SchemaPoll.Procedure));
> 			threadPoll.Start();	
> 			
> 			
> 		}
> 	}
> 	
> 	public class SchemaServer
> 	{
> 		public SchemaServer()
> 		{
> 		}	
> 		public void Procedure()
> 		{
> 			while(true)
> 			{
> 				//do something
> 			}			
> 		}
> 	}
> 	
> 	public class SchemaPoll
> 	{
> 		public static void Procedure()
> 		{
> 			while(true)
> 			{
> 				try
> 				{
> 					//CommandInvoker.Invoke() method is used to scan oracle database
> table to retrieve some data
> 					CommandInvoker.Invoke();						
> 					Thread.Sleep(5000);
> 					//CommandFeeder.Feed() method is used to scan oracle database table
> to retrieve some data
> 					CommandFeeder.Feed();		
> 				}
> 				catch(Exception ex)
> 				{
> 					Console.WriteLine("Exception in
> SchemaPoll.Procedure:{0}",ex.Message);
> 				}
> 			}			
> 		}
> 	}
> 	
> }
> 

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